<template>
  <el-form :inline="true" :model="cForm" class="demo-form-inline" :disabled="!isShowList">
    <el-form-item label="一级分类">
      <el-select v-model="cForm.category1Id" placeholder="请选择" @change="changeCategory1">
        <el-option :label="c1.name" :value="c1.id" v-for="c1 in category1List" :key="c1.id"></el-option>
      </el-select>
    </el-form-item>
    <el-form-item label="二级分类">
      <el-select v-model="cForm.category2Id" placeholder="请选择" @change="changeCategory2">
        <el-option :label="c2.name" :value="c2.id" v-for="c2 in category2List" :key="c2.id"></el-option>
      </el-select>
    </el-form-item>
    <el-form-item label="三级分类">
      <el-select v-model="cForm.category3Id" placeholder="请选择" @change="changeCategory3">
        <el-option :label="c3.name" :value="c3.id" v-for="c3 in category3List" :key="c3.id"></el-option>
      </el-select>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  name: 'CategorySelector',
  props: {
    isShowList: Boolean
  },
  data () {
    return {
      cForm: {
        category1Id: '',
        category2Id: '',
        category3Id: ''
      },
      category1List: [],
      category2List: [],
      category3List: []
    }
  },
  mounted () {
    this.getCategory1List()
  },
  methods: {
    // 获取所有的一级分类
    async getCategory1List () {
      const result = await this.$API.category.getCategory1()
      if (result.code === 200) {
        this.category1List = result.data
      }
    },
    // 根据选中的 1 级分类 id 获取所有的二级分类列表
    async changeCategory1 (category1Id) {
      this.cForm.category2Id = ''
      this.cForm.category3Id = ''
      this.category2List = []
      this.category3List = []

      this.$emit('changeCategory', { categoryId: category1Id, level: 1 })

      const result = await this.$API.category.getCategory2(category1Id)
      if (result.code === 200) {
        this.category2List = result.data
      }
    },
    // 根据选中的 2 级分类 id 获取所有的三级分类列表
    async changeCategory2 (category2Id) {
      this.cForm.category3Id = ''
      this.category3List = []

      this.$emit('changeCategory', { categoryId: category2Id, level: 2 })

      const result = await this.$API.category.getCategory3(category2Id)
      if (result.code === 200) {
        this.category3List = result.data
      }
    },
    // 三级分类被选中时,通知父组件发请求获取属性数据进行展示
    changeCategory3 (category3Id) {
      this.$emit('changeCategory', { categoryId: category3Id, level: 3 })
    }
  }
}
</script>

<style>
</style>